Sen. Robert Menendez talks with reporters outside the Senate Chamber after voting for the cloture vote on the Tax Compromise bill in the U.S. Capitol December 13, 2010 in Washington, DC. (Photo by Win McNamee/Getty Images)

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New Jersey Sen. Bob Menendez took an unreported trip to the Dominican Republic on a plane belonging to Dr. Salomon Melgen in 2008, sources told Fox News on Tuesday, raising new concerns about whether the senator has offered a complete accounting of his travel with the wealthy donor.

Menendez has acknowledged taking three Dominican getaways on Melgen’s private jet, all in 2010. The Democratic Senatorial Campaign Committee paid Melgen for one of those trips. Menendez reimbursed him $58,500 for the other two out of his personal funds in January 2013, more than two years after the trips.

“Senator Menendez has traveled on Dr. Melgen’s plane on three occasions, all of which have been paid for and reported appropriately,” the senator’s spokesman said in late January.